Hay lift



June, 9, 1.2942.

w. E. uEpLUND STAI.

HAY LIFT Filed Aug. 4, 1941 Patented June 9, 1942 I Wilfred E. .He'dlund and :Martin R. `Hcdlund, Boyceville, Wis.

Application 'August 4, 1941, Serial No1-4052280 (Cl. 'i4-219) Claims.

This invention -relates to hoists for hay rakes and the like.

AA common -method of elevating Vloaded hay forks into the lofts of barns is with a block and tackle arrangement wherein the rope is pulled by horses to elevate the load. Then the horses must be maneuvered to return the rope and permit the 'fork to be Vlowered to pick up another load.

`Itisan-object of-'our invention -to provide an electrically driven hoist adaptable Ifor use as a hay rake hoist wherein relatively simple `yet highlyecient means is provided -for -turning a rope winding drum in the proper fdirection `"for hoistinga load and then releasing the-drum to permit -it tofreverse quicklyfand easily.

Another lobject of the invention'is to provide means forcutting out the -electric motor when thedrum is releasedand for again starting the motor `when A'the drum is f connected -for hoisting.

A-furtherlobject of the inventionfis to provide a motor driven hoisting apparatus having a'belt drive wherein agpower pulley is 'quickly-disconnected from the-belt and maintained-completely out of contact With the belt to halt the applicationof power to the-winding drum -and also to maintain the disconnected blt in proper alignment so that the belt and power pulley will properly re-engage -when desired.

Still 'another object of theinvention is to provide means for maintaining the various belts under proper tension.

These and other objects `and advantages of the invention will more'fully appear Afrom the following description made in vconnection with the accompanying-drawing, wherein like reference characters refer tothe samefparts throughout' the views, and, in which:

Fig. lis a plan view; and

Fig. V2 is a side elevation of an-embodimentof our invention.

In'the drawing there is shown-a fframe comprising a pair of lower longitudinal side members 3 and-La pair of cross members 5 at'one end and a pair of uprights -6 vat the other end,.said uprights being connected'by a transverse member 1.

The frame 'uprights-I carry bearings 8 which rotatably support a shaft 9, the latter forming a portion of a spool IU having ends II and I2. The spool end I2 comprises a driven pulley having grooves I3 to receive a pair of V belts I4. The belts I4 also run over a relatively small double grooved pulley I5 Which is mounted on fromf-the upperportions'oftheuprights Ifdowna shaft I6 rotatably carried by a pair of arms 55 wardlylto the opposite ends 'of 1the' frame `members"3 and vII to strengthen said uprights. Y 'he diagonal support f2`1has-a pair of short -arms 29 extending "upwardly thereirom,A and! to said Y arms is pivoted a *small -double grooved pulley 30. Pivotally connected to the side frame member '4 at'3`I is 'ajpair-of arms T342 which carry a small double vgrooved pulley `A3ft-of approximately the same sizeas fthe pulley 30. Aftension spring 34 is connectedbetween the pivotedgarm-'32 and theLcliagonal-brace 2I to normally urge the pulley carrying-armf3f2 vtoward'the right. Connected to the vfarm A'I'I extending outwardly from the U- shaped yoke I9 isja lever 35 which `is also pivotally V`connected tola `lever36 which swingsin a suitablebea'ring 331. `It should'be noted that the lowerendjof the lever 35 is provided with 'a pair-of apertures so -that the distance from the vvlever 3'6'tothearm vI-'I can be varied. rhe upper portion of the lever 36 lis provided with la 'plurality of apertures l3B which are adapted to'slectively receive ran end of 'a rod v39 which is connectediwithfa tension spring 40, said spring being adapted to'. connect-with a suitable hand lever-for ypullingfthe rod "39 to the right.

n"'he arm f8 extending outwardly yfrom the U'- shaped -yoke I9 has=a wire or'cord 4I connected thereto, and the cord 4I -extendsto the control handle 42 of a circuit controller 43. While the wire lis not yshown-it is, of course, to be underl- 'stood thatthe -switch 43 is adapted to make and breakthe-lectri'c*circuit to the motor 23 when theyoke `Il! :and arms I'I and I'8 are swung upwardly and downwardly. p

In operation arhoisting rope is 'connected to th'espool IIJ preferably -being tied to a `short yrod E'44 y'at the -rear end of the 'spool as viewed in Fig. 1. 'I'he rope is then connected to the hay rake or other device to be lifted in any approved manner. 'I'he U-shaped pivoted yoke I9, its arms II and I8, and pulleys I5 and 22 which are supported by said arms lie in a position which is lower than the one illustrated in Fig. 2. The yoke and pulley unit tends to drop downwardly under its own weight and is limited in its downward movement by the lever actuating rod 39. In its downward position the small power pulley I5 has passed betweeen the small pair of idler pulleys 30, 33, and the V belts I4 are supported between said idler pulleys 30, 33 and the driven pulley I2 at one end of the spool I9. Thus the small power pulley I5 is entirely out of contact with the driven belt I4 and should the motor 26 be rotating it will have no effect upon said belt I4. The idler pulley 33 which is pivoted and normally urged to the right between spring 3l will spread away from the other idler pulley 30 and the power pulley I5 as the latter is lowered. Said idler pulleys 30, 33 in addition to keeping the belt I4 out of engagement with the power pulley I5 when the latter is lowered also function to maintain the belts I4 in proper alignment so that they will fit into the grooves of the power pulley I5 when the load 39 is drawn to the right and the levers 35 and 36 raise the arms I'I and IB and the yoke I9.

The position of Fig. 2 is an intermediate position, and when the power pulley I5 is raised a little more the idler pulley 33 will swing closer to the idler pulley 30, the belt is out of contact with the idler 30 but the idler 33 will remain in contact with the belt and serve as a belt tightener.

When the yoke I9 is swung up it pulls the cord 4I to close the switch 43 and energize the motor 26. This drives the large power pulley 22 which also drives the power pulley I5, and of course, the driven pulley I2 is rotated through its V belt connection with said power pulley I5.

When a load such as a rake full` of hay has been raised and conveyed to a point over the hay loft it is then necessary to drop it so that it can be unloaded. This, of course, involves a reversal of the drum or spool I and that is ac-complished by permitting the rod 39 to move to the left so that the power pulleys I and 22 can drop downwardly. This suddenly disengages the power pulley I5 from the belt I4 and even though the motor is cut olf by actuation of the switch 43 it is still rotating but this continued rotation has no effect upon the belts I4 and driven pulley I2 which can immediately reverse under the weight of the loaded hay fork.

Attention is called to the fact that the yoke I9 has its pivot point 20 disposed slightly above the axis of the motor shaft 25. Therefore, when the yoke I9 is raised to energize the motor 26 and rotate the entire group of pulleys and wind- Y ing drum, the V belt 23 connecting the motor pulley 24 and the large power pulley 22 will be tightened more than when the yoke I9 is lowered and the motor and power pulley 22 are idling to a stop.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the various parts without departing from the scope of our invention.

What is Iclaimed is:

1. A hoist for hay rakes and the like comprising, a winding drum, a rotary power device including a pulley, a driven pulley connected to said winding drum, a belt connecting said power pulley to said driven pulley, means for shifting said power pulley toward said driven pulley, and a pair of pulleys adjacent said power pulley at opposite sides thereof to receive said belt when said power pulley is shifted toward said driven pulley and to maintain said belt in alignment and out of contact with said power pulley when the latter is shifted toward said driven pulley.

2. The structure in claim 1 and one of said pair of pulleys being yieldably movable away from said driven pulley to maintain tension upon said belt when said power pulley is shifted toward said driven pulley and said .belt is supported by said pair of pulleys to assist in maintaining said belt in proper alignment with said power pulley when out of contact with the same.

3. The structure in claim 1 and one of said pair of pulleys being movably and yieldably urged away from said driven pulley to maintain said belt under tension when said power pulley is shifted toward said driven pulley, and said movable pulley being maintained in engagement with said belt when said power pulley is shifted away from said driven pulley and into driving contact with said belt and the other of said pair of pulleys being out of engagement with said belt when said power pulley is shifted away from said driven pulley and into contact with said belt.

4. A hoist for hay rakes and the like comprising, a winding drum, a rotary power device including a pulley, a driven pulley connected to said winding drum, a belt connecting said power pulley to said driven pulley, means for shifting said power pulley toward said driven pulley, means for receiving said belt when said power pulley is shifted toward said driven pulley to maintain said belt out of contact with said power pulley and to maintain said belt in proper alignment for engagement with said power pulley when said power pulley is shifted away from said driven pulley.

5. A hoist for hay rakes and the like comprising, a winding drum, a motor having a drive shaft with a pulley thereon, a power pulley of large diameter drivingly connected to said pulley on said motor shaft, a relatively smaller pulley connected to and driven by said large pulleyya driven pulley connected to said winding drum, a belt connecting said driven pulley and said smaller pulley, means for shifting said smaller pulley toward said driven pulley, a pair of pulleys adjacent said smaller pulley and in spaced relation to permit said smaller pulley to pass between said pair of pulleys when shifted toward said driven pulley, said pair of pulleys being positioned to receive said belt when said smaller pulley is shifted toward said driven pulley to maintain said belt out of contact with said smaller pulley when so shifted and also to maintain said belt in proper alignment for contacting of said belt with said smaller pulley when the latter is shifted away from said driven pulley.

WILFRED E. HEDLUN'D. MARTIN R. I-IEDLUND. 

